chemical engineering refractory technology MCQs – Page 10

Practise multiple-choice questions from chemical engineering refractory technology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering refractory technology Mcqs

181. Pick out the wrong statement ?
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A. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous

B. Ceramic materials are brittle in nature

C. Non-oxide ceramic materials generally act as a semi-conductor

D. te is termed s glass

E. Ceramic materials do not undergo vitrification on heating

182. Fusion point of a basic refractory material is__________________?
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A. Increased by the addition of acid oxides

B. Always less than 1000C

C. Not affected by the addition of acid oxides

D. Reduced by the addition of acid oxides

183. Refractory bricks having lower porosity have_________________________?
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A. High insulating properties

B. Greater strength

C. Low thermal conductivity

D. Low heat capacity

184. Pick out the wrong statement?
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A. Silica occurs in nature in all cellular, amorphous or crystalline form

B. Sand & coke is the main raw material for the manufacture of silicon carbide

C. Carbon refractories cannot be used in the furnaces operating under reducing conditions

D. Mullite can be obtained by the heating of alusite, kyanite or sillimanite

185. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?
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A. 55

B. 80

C. 90

D. 70

186. Hot blast main (carrying air at 1000C) in blast furnace are lined with ______________ bricks?
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A. Fireclay

B. Magnesite

C. Silica

D. Zirconia

187. Permeability of bricks is a measure of the_________________?
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A. Rate at which a fluid will pass through the pores

B. Melting point

C. Expansion during heating

D. Refractoriness

188. Pick out the wrong statement ?
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A. Graphite and metals are the good electrical conductor among the refractories and others are all

B. naces</strong>

C. Electrical conductivity of refractory is not important, when these are to be used in electrical

D. ductivity

E. Refractories used for lining electrical furnaces should ordinarily have very low electrical

F. Electrical conductivity of porous refractory material is low

189. High alumina refractory compared to fireclay bricks have____________________?
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A. High resistance to thermal shock and creep

B. Low refractoriness

C. Less load bearing capacity

D. Less resistance to slag attack

190. Addition of zircon to silica refractory brick improves its_____________________?
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A. Crushing strength

B. Resistance to slag attack

C. Both A. and B.

D. Neither A. nor B.

191. Which of the following is not a high alumina refractory material ?
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A. Sillimanite

B. Periclase

C. Kyanite

D. Diaspore

192. Fireclay bricks is not used for lining the__________________?
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A. Cupola

B. Roof of open hearth furnace

C. Bottom of hot metal mixer

D. Gas producer

193. Pick out the wrong statement?
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A. Main constituents of clay are alumina and silica

B. Fluxing material like lime is added in clay to reduce the vitrification temperature

C. Vitrification of fireclay material is done to increase its porosity

D. uces its shrinkage on burning

E. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and

194. Bottom of basic open hearth furnace are constructed of__________________?
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A. Silicon carbide bricks

B. Porous fireclay bricks

C. Semi-silica bricks

D. Dead burnt magnesite ramming mass

195. Fireclay bricks are not used in the_____________________?
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A. Blast furnace

B. Cupola

C. Wall of coke oven

D. Hot blast stove

196. The maximum linear expansion of silica bricks during firing is about ______________ percent?
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A. 0.5

B. 2

C. 1

D. 3.5

197. Which is not a natural insulating material ?
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A. Vermiculite

B. Asbestos

C. Diatomaceous earth/kieselgur

D. None of these

198. ______________ bricks should not be used in oxidising atmosphere?
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A. Silica

B. Fireclay

C. Tar dolomite

D. Carbon

199. Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
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A. Silicon carbide

B. Zirconium sulphate

C. Silicon nitride

D. Crystalline magnesia

200. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?
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A. Corundum

B. Siliceous fireclay

C. Fireclay

D. Silicon carbide

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